Overseaming-machine.



S. W. AVIS.

OVERSEAMING MACHINE.

APPLICATION FILED OCT. 19, 1915.

Patented June 5, 1917.

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- 66 INVENTUR;

7 wwda/azlaoia BY W His TT s. w AVIS. OVERSEAMING MACHINE. APPLICATION FILED OCT. 19, 1,915

- Patented June 5, 1917.

2 SHEETS-SHEET'2.

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UNTTED TATE PATENT OFFIQE.

SAMUEL W. AVIS, 0F HARTFORD, CONNECTICUT, ASSIGNOR TO THE MERR OW MACHINE COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

OVERSEAMING-MACHINE.

Application filed October 19, 1915.

To all whom it may concern:

Be it known that I, SAMUEL IVALTER Avis, a citizen of the United States, residing at Hartford, in the county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Overseaming- Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forminga part of this specification, and to the figures and letters of reference thereon.

This invention relates to trimming mechanism for sewing machines. Trimming mechanism as commonly employed in connection with machines for overseaming is characterized by two cutting blades mounted in advance of the stitch forming elements. These blades cooperate to trim from the edge of the work, material in excess beyond the margin which it is desired to cover or finish with overedge stitching.

Successful operation of trimming mechanism is largely a matter of nicely edged cutters effectively held, maintained and operated in precise relation. Under the most favorable conditions cutters require more or less sharpening. This necessitates their removal from their holders and subsequent readjustment therein often attended with inconvenience owing partly to the close proximity in which it is desirable to place trimming mechanism with respect to the point where stitches are applied to the work.

It is the object of the present invention to provide, for the cutters, effective holders conveniently accessible for purposes of adjustment, simple in design and adapted to afford proper clearance for adjacent movable parts of the stitching and feeding mechanism.

In the accompanying drawings I have shown one convenient form of embodiment of the invention which will be set forth fully in the following description. The scope of the invention, however, is not limited to the exact form of device illustrated and described, but is defined by the appended claims.

Referring to the drawings Figure 1, is a front view of a M'errow type of overseaming machine equipped with my improved trimming mechanism, certain Specification of Letters Patent.

Patented June 5, 1917.

Serial No. 56,713.

Fig. 4, is an end view of the machine shown in Fig. 1.

Fig. 5, is a sectional view approximately on line 55 of Fig. 1, looking in the direction of the arrow, and showing the upper and lower cutter holders together with associated parts, and,

Fig. 6, is a sectional detail view on line 6-6 of Fig. 1 looking in the direction of the arrow.

Throughout the several views of the drawings similar characters of reference designate similar parts.

Inasmuch as the trimming mechanism comprising the present invention, is closely associated with the stitching mechanism, and feeding mechanism, and dependant upon a combined showing with said elements to bring out important features of advantage, I will first proceed to describe the stitch forming elements, mechanism for actuating them, and a part of the feed mechanism.

Extending longitudinally of the machine frame 3, are the main driving shaft 4, and a similar shaft 5, to which are respectively secured by set screws 6 and 7, the cam cylin ders S and 9. Integral with these cam cylinders, the, purpose of which will hereinafter appear, are respectively the interineshing gears 10, and 11, by virtue of which rotation of the driving shaft together with its cam cylinder effects rotation in unison therewith of cam cylinder 9, and shaft 5.

Projecting from the enlarged head 12, of shaft 5, is an eccentric stud 13, to which a pivotally mounted needle carrier 14, is connected by a link 15. Through this connection, when shaft 5 is rotated, an oscillatory motion is imparted to the needle carrier, thereby causing the curved eye pointed needle 16, to reciprocate in g a curved path extending above and below the needle plate 17 Cam cylinders 8 and 9, are located within a cavity 18, of the machine frame, a closure for which is provided in the frame cap 19,

which is secured to the machine frame by screws 20. Mounted for sliding movement upon the inner face of the frame cap 19, in the guideway 21, is a block 22, to which is pivoted a carrier 23, for what is termed the upper looper 24, which looper, as shown, comprises a thread engaging hook. Extending from opposite sides of said carrier 23, are arms 25 and 26, each of which is provided with a roll bearing stud 27, and 28, adapted respectively to engage cam grooves I 29, and-30, in the respective cam cylinders 8 and 9. When said cam cylinders are rotated the cotiperative effect of the cam grooves 29 and 30, upon the carrier 23, causes the looper 24, to reciprocate in a curved path extending around the inner lateral edge of the needle plate, that is, in a plane substantially at right angles to the plane in which the needle is reciprocated.

A lower looper as 31, having thread receiving eye, is provided with a carrier 32, held at one end by a pivot 33, which projects from the inner face of the framecap, (at

the lower left hand corner as seen in Fig. l). A roll bearing stud 34, with which the carrier 32, is provided, is adapted to engage a cam groove 35, in cam cylinder 8. Upon rotation of the cam cylinder said groove 35, causes carrier 32, to oscillate, and the free end of looper 31, moves in a co rresponding path beneath the needle plate. in a plane crossing the plane of the, path of the needle.

described as follows :-The cutter blade 41., which is of angle form 111 cross section, is

adjustably mounted upon a slide 42, in oblique relation to the plane traversed by the cutting elge. Saidcutting edge is formed at the end of the blade, on one leg thereof, while the other leg is extended in the cutting plane to serve as a guard for rhelower cutting blade, as well as a guide by which to set the latter, as will hereinafter appear. The slide 42, is adjustably held in a guideway 43, of a carrier 44, which carrier is mounted for swinging movement upon a stud 45, supported at the rear of the machine frame. Intermediate its ends, the carrier 44, is provided with a capped opening to receive an eccentric engaging block 46, the eccentric 47, therefor, being integral with the cam cylinder 9, from which it will be clear that an oscillatory motion is imparted to the carrier upon rotation of the cam cylinder, or in other words when the machine is set in motion. 7

Means for mounting and adjusting the lower cutter will now be described.

Suitably secured to the machine frame is a standard 60, rising from a somewhat enlarged base 61, and provided at or near its top with a boss or head 62, which is extended laterally, or at right angles to the direction of the feed of the machine. Extending through the head 62, is a bore 63, slightly reduced as at 64, to fit the shank 65, of a carrier 66, for the lower cutting blade.

An integral collar 67, on shank 65, fits the larger part of bore 63, and maintains alinement of the carrier, so that free longitudinal movement thereof may take place for a purpose that will appear. As a means for effecting such longitudinal movement, there may be provided the spring 68, which surrounds shank 65, and bears against shoulder 69, and collar 67. At one end carrier 6,6, is provided with a T-slotted head 70, adapted to receive the cutter 71, and a clamp 72. The latter is perforated to receive the reduced end- 73, of a pin 74, which is slidable in a bore 75, of carrier 66. Threaded into that end of bore 75, which is opposite to the T-slotted head is an adjusting screw 76, by means of which pin 7 4, may be thrust endwise to force clamp 72, against cutter 71, thus firmly securing. the latter between the clamp and the opposite walls of the T-slot. When the cutter is thus clamped, and at the proper height with re spect to the needle plate, it may subsequently be laterally adjusted into position to 006perate with the upper cutter. Thislatter adjustment involves bodily movement of the cutter carrier, in the direction of its longitudinal axis, which movement may be effected by the spring 68, asalready stated. The tendency of said spring to move the cutter carrier is normally resisted by a set screw as 77, tapped into the head 62, and adapted to engage a flattened spot 77 on the carrier shank 65, (see Fig. When inserting or adjusting a cutter in the T-slotted head, it is convenient to have the carrier slightly withdrawn from the position in which it is shown in Fig. 1. To thus withdraw the carrier the screw 77, is first loosened, then by grasping the set screw 76, the carrier may be moved in opposition to spring 68, a suitable amount, andheld inthe desired position by resetting the screw 77. Now, assuming the cutter to have been properly secured in the carrier, set screw 76 is again released, thereby permitting said carrier to move forward until the face of the, lower cutter engages the upper cutter on the guide'surface thereon already mentioned, which assists in relalateral adjustment.

tively locating the cutters to effect the best results. The most advantageous relative position of said cutters, is indicated by a certain delicate pressure brought to bear be tween the engaging surfaces mentioned, and this pressure may be repeatedly established without appreciable variation, if efiected by an unchanging degree'of force such as that exerted by the spring 68. Said spring then, obviously automatically positions the lower cutter in the best possible relation to the upper cutter and the adjustment thus effected may be maintained by securing the cutter carrier with the set screw 77. An effective support, directly opposed to the thrust applied. to the lower cutter as it operatively engages the work, is provided in the fiat surface 78, of the standard 60, with which surface, the underside of the T-slotted head engages. Said surface 78 also co'ciperates with another surface, hereinafter mentioned, to prevent rotary movement of the cutter carrier. Intersecting the surface 78, is a recess 79, which furnishes clearance for the lower cutter, permitting its lengthwise and Also the standard 60, is slotted, as at 80, to accommodate the curved arm, apertured portion or shank 82, by which the feed dog 83, is connected to its carrier 84. The lower cutter carrier passes laterally through the curved arm 82, so that the latter may be extended to the front, where space is available, in which to make it amply strong, and to permit of its range of movement.

The feed mechanism illustrated, which includes as an element thereof, the dog 83, is of the differential type, wherein an additional feed dog as 83, is provided together 40 with its carrier 84, which carrier is opera able independently of carrier 84, to effect a cooperation of the two dogs in a manner fully set forth in United States Patent #1371818, granted William H. Stedman, September 2nd, 1918. Constructions with which I am familiar, do not involve the arrangement of a cutter carrier or support, between such elements of the feed mechanism as the dogs 83 and 83' as in the present invention. It will be quite apparent, however, that such an arrangement is most advantageous with respect to disposition of an opposing surface to resist the pressure to which a cutter is subjected. Designated by 88, and best illustrated in Figs. 1 and 2, is a plate, associated in tongue and groove relation with the upper surface of standard 60, to which it is held, with provision for its slight adjustment, by the screw 89. One side of this plate which is extended downwardly as at 91, is provided with a passage 92, for guiding a thread to-the lower looper. The under surface of the depending part 91, engages a flattened portion of cutter carrier 66, this in conjunction with the above described bearing surface, 78, resisting any tendency of said carrier to rotate.

Supported by plate 88, is a needle guard 93, the shank 94, of which is adjustably held in the groove 95, by screws 96. The arm 9?, connecting said shank with the needle guard proper93, is deflected, to position said guard beneath the needle plate, the latter being supported by both an upward extension 99, of standard 60, and the plate 88. Proper alinement of the needle plate is assured by a tongue and groove relation with plate 88, while a screw 100, passing through the needle plate and into extension 99, serves to secure said relation and also to prevent vertical displacement of the needle plate.

Tensions, take-ups, thread guides and other parts not directly related to the present invention are illustrated in the drawings but need not be described herein.

Having thus described my invention, I now claim 1. In a sewing machine including feeding mechanism and trimming mechanism, an apertured feed element, a cutting element, and a stationary support for the cutting element extending laterally through the aperture in the feed element.

2. In a sewing machine including feeding mechanism and trimming mechanism, an apertured feeding element and an apertured cutting element, the feeding element extending into the aperture in the cutting element, and the cutting element extending laterally into the aperture in the feeding element.

8. In a sewing machine including feeding mechanism and trimming mechanism, an apertured feeding element, a cutting element, and an apertured support for the cut ting element, the feeding element extending into the aperture in the support and the cutting element extending laterally into the aperture in the feeding element.

4. In a sewing machine including feeding mechanism and trimming mechanism, an apertured feeding element, a cutting element, a carrier for the cutting element, ex-

tending laterally through the aperture in the feeding element, and means for sup porting the carrier on'opposite sides of the feeding element.

5. In a sewing machine including feeding mechanism and trimming mechanism, an ap ertured feeding element, a cutter blade, a support for the cutter blade extending through the aperture in the feeding element, means on one side of the feeding element for clamping the cutter blade and means on the other side for actuating the clamping means.

6. In a sewing machine including feeding mechanism and trimming mechanism, an apertured feeding element, a cutter blade, a carrier for the cutter blade extendthe cutting element on one side of the feeding element and means for adjusting iton the other side of the feeding element.

8. In combination with a sewing machine,

carrier for clamping the cutter and means within the support for moving the carrier.

ll. In combination'in a sewing machine, trimming mechanism, including a normally stationary cutter, a carrier for said cutter, a support for the carrier, means within the carrier for clamping the cutter, a spring for moving said carrier and means for securing the carrier against the'action of said spring.

'15. In combination in a sewing machine, trimming mechanism including a normally stationary cutter, a carrier having a slotted head to receive the cutter a su ort havin 7 b trimming mechanism including 'a movable,

cutter and a normally stationary cutter, a carrier for the latter, a support forfthe carrier, and means for automatically moving the carrier with respect to the support-to effect relative adjustment of the cutter.

9. In combination in a sewing machine, trimming mechanism including a normally stationary cutter,amovable carrier for said a bore to receive the carrier and a seat to engage the slotted head of the carrier, means within the carrier. for clamping the cutter in the slotted head and a spring surrounding the carrier within the support for moving said carrier.

16. In a sewing machine and in combination wlth differential feedlng mechanlsm,

trimming devices including a support for cutter whereby it may be laterally adjust- 7,

ed, and a support having a surface engaging the carrier contiguous to each of the lateral faces of the cutter- 10. In combination in a sewingmachine, trimming mechanism including a normally stationary cutter, a carrier having a T- slotted head to'receive said cutter, a clamping member for engaging the cutter, a rod within the carrier, and means for moving the rod to actuatethe clamping member.

11. In combinationin a, sewing machine, trimming mechamsm including a normally stationary cutter, a carrier for the cutter,

a support having separated portions respectively engaging a cylindrical portion ofthe carrier and a flat surface of the'cutter receiving head of the carrier, means for moving the carrier endwise, and a plate secured to the support and engaging on the carrier a flat surface. opposed to the surface engaging the cutter head whereby rotation of the carrier is prevented.

12. In combination in a sewing machine, trimming mechanism including a normally stationary cutter, a carrierfor said cutter, a support having separated portions to engage respective endsof the carrier, and a needle plate secured to the separated portions of the support.

13. In combination in a sewing machine,

trimming mechanism including a normally stationary cutter, a carrier for said cutter,

a support for the carrier, means within the Copies of this patent may be obtained for five cents each, by addressing-the Commissioner of Patents,

feed dogs and means for their operation,

one of the trimming cutters extending between the tWo feedingelements of the differential feed. 7

17 In a sewing machine including two means for trimming the edge of the material mcludlng a movmg cuttercooperatmg 1with a stationary cutter, the latter extendimg laterally between the two feed dogs.

18. In a sewing machine including two feed dogs adapted to operate difierentially,

and in combination therewith trimming devices including a moving cutter cooperat- .ing with. a second cutter supported by a holder extending between the two feed dogs and adjustable laterally with respect to the lineof the feed.

19. In an overseaming machine including feeding mechanism, trimming mechanism,

I and a reciprocatory looper, a cutting elemerit, a support for the cutting element, and

a feeding element having an aperture to 20. The combination in an overseaming machine of d lferentlal feeding mechanism,

a reciprocatory looper, and trimming devices including a support for a cutter, the path of the looper and the support for the Washington, I). C.

afford clearance-for the looper and the support. 

